For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment, visit http://www.usgs.gov or call 1-888-ASK-USGS.For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprodTo order this and other USGS information products, visit http://store.usgs.gov Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner. Thanks are also extended to all of the USGS hydrologists and hydrologic technicians who made extraordinary efforts during and after the floods in collecting and analyzing the data for this report. The authors would also like to acknowledge William F. Coon and Phillip J. Zarriello of the USGS for their detailed technical reviews of the report and Mary S. Ashman (USGS) for her thorough editorial review of the report. The major contributions to the graphics in the report by the geographic information system and publications units of the USGS New York Water Science Center are also much appreciated. 28-29, 2011, January 19-20, 1996, and April 4-5, 1987, and corresponding elevations for the 10-, 2-, 1-, and 0. Floods of 2011 in New YorkBy Richard Lumia, Gary D. Firda, and Travis L. Smith AbstractRecord rainfall combined with above-average temperatures and substantial spring snowmelt resulted in record flooding throughout New

From September 2004 to June 2006, the Delaware River in New Jersey, New York, and Pennsylvania experienced three major floods that caused extensive damage. The Federal Emergency Management Agency (FEMA) needed updated information on the flood magnitude and frequency for the eight active streamflow-gaging stations along the main stem Delaware River in New Jersey, New York, and Pennsylvania that included the three recent floods in order to update its flood insurance studies. Therefore, the U.S. Geological Survey (USGS) computed updated flood magnitude and frequency values following the guidelines published by the Interagency Advisory Committee on Water Data in its Bulletin 17B. The updated flood-frequency values indicate that the recurrence interval of the September 2004 flood ranged from 20 to 35 years, the recurrence interval of the April 2005 flood ranged from 40 to 70 years, and the recurrence interval of the June 2006 flood ranged from 70 to greater than 100 years. Examination of trends in flood discharges indicate no statistically significant trends in peak flows during the period of record for any of the eight streamflow-gaging stations.

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Vertical coordinate information is referenced to National Geodetic Vertical Datum of 1929 (NGVD 29). Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83).

Photographs showing A. Study site no. 9, County Route 29A (Wynkoop Road) bridge over the Esopus Creek at Hurley, N.Y on April 3 at about 2:30 p.m. B. Area between study sites 12 and 13 at the Kingston Circle, junction of Interstate Route 587, Route 28 and Washington Ave.